1. Thaw frozen langostinos: If using frozen langostinos, thaw them properly in a refrigerator overnight. Alternatively, place them in a colander and run under cold water for a few minutes until defrosted.
2. Prepare the langostinos: Rinse the langostinos thoroughly under cold running water. Using your hands or a small paring knife, remove the head and shell of each langostino. Devein them by making a shallow incision along the underside and pulling out the dark vein.
3. Season: In a mixing bowl, combine the langostinos, olive oil, salt, pepper, and any desired herbs or spices. Toss to coat evenly.
4. Choose your cooking method: There are several ways to cook langostinos, including:
- Boiling: Bring a pot of salted water to a boil. Add the langostinos and cook for about 2-3 minutes, or until the shells turn pink and the flesh becomes opaque.
- Steaming: Place the langostinos in a steamer basket over boiling water. Cover and steam for about 5-8 minutes, or until cooked through.
- Grilling: Preheat a grill to medium heat. Brush the grates with oil to prevent sticking. Grill the langostinos for 2-3 minutes per side, or until the shells are lightly charred and the flesh is cooked through.
- Pan-frying: Heat some olive oil in a large frying pan over medium heat. Add the langostinos and cook for 2-3 minutes per side, or until the shells are pink and the flesh is opaque.
5. Serve: Langostinos are best served immediately. You can garnish them with fresh herbs or lemon wedges. They pair well with various dipping sauces, such as cocktail sauce, tartar sauce, or garlic butter.